Load transfer adaptive traction control system
First Claim
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1. A method for controlling a vehicle with a traction control system that accounts for load transfers during vehicle operation, the method comprising:
- controlling a drive wheel of the vehicle according to a modified power train torque request, the power train torque request being modified in response to torque transfer on an inside driven wheel of the vehicle and based on a lateral acceleration of the vehicle, a longitudinal acceleration of the vehicle, a yaw rate of the vehicle, and a difference between undriven wheel speeds of the vehicle.
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Abstract
A method of controlling a vehicle that includes determining a dynamic normal load for the vehicle wheel, modifying the requested torque signal from a traction control system in response to the dynamic normal load to form a modified requested torque and controlling the engine in response to the modified requested torque. The controlling may be performed using the ratio of the dynamic normal load and the steady state normal load to form the modified requested torque.
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Citations
19 Claims
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1. A method for controlling a vehicle with a traction control system that accounts for load transfers during vehicle operation, the method comprising:
controlling a drive wheel of the vehicle according to a modified power train torque request, the power train torque request being modified in response to torque transfer on an inside driven wheel of the vehicle and based on a lateral acceleration of the vehicle, a longitudinal acceleration of the vehicle, a yaw rate of the vehicle, and a difference between undriven wheel speeds of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling a vehicle with a traction control system that accounts for load transfers during vehicle operation on a road surface, the method comprising:
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inputting constants representing gravity, a distance from a front axle to a center- of-gravity of the vehicle, a distance from a rear axle to a center-of-gravity of the vehicle, a mass of the vehicle, a height of the center-of-gravity of the vehicle, and a track width of the vehicle; inputting signals from sensors including a yaw rate sensor, a lateral acceleration sensor, and a longitudinal acceleration sensor; calculating a static normal load force of the inside driven wheel; calculating a ratio of a steady state cornering normal force of the inside driven wheel to the static normal load force of the inside driven wheel; calculating a ratio factor representing a ratio of a previous ratio of the steady state cornering normal force of the inside driven wheel to the static normal load force of the inside driven wheel to a current ratio of the steady state cornering normal force of the inside driven wheel to the static normal load force of the inside driven wheel; modifying a requested torque to reflect the change in the ratio of the steady state cornering normal force of the inside driven wheel to the static normal load force of the inside driven wheel; and controlling one or more of an engine of the vehicle and brakes of the vehicle according to the modified requested torque. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification